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/*

 * Copyright (c) 2002 Michael Niedermayer 

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License along

 * with FFmpeg; if not, write to the Free Software Foundation, Inc.,

 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 */

/**

 * @file

 * Shape Adaptive Blur filter, ported from MPlayer libmpcodecs/vf_sab.c

 */

#include "libavutil/opt.h"

#include "libavutil/pixdesc.h"

#include "libswscale/swscale.h"

#include "avfilter.h"

#include "formats.h"

#include "internal.h"

typedef struct {

    float radius;

    float pre_filter_radius;

    float strength;

    float quality;

    struct SwsContext *pre_filter_context;

    uint8_t *pre_filter_buf;

    int pre_filter_linesize;

    int dist_width;

    int dist_linesize;

    int *dist_coeff;

#define COLOR_DIFF_COEFF_SIZE 512

    int color_diff_coeff[COLOR_DIFF_COEFF_SIZE];

} FilterParam;

typedef struct {

    const AVClass *class;

    FilterParam  luma;

    FilterParam  chroma;

    int          hsub;

    int          vsub;

    unsigned int sws_flags;

} SabContext;

static int query_formats(AVFilterContext *ctx)

{

    static const enum AVPixelFormat pix_fmts[] = {

        AV_PIX_FMT_YUV420P,

        AV_PIX_FMT_YUV410P,

        AV_PIX_FMT_YUV444P,

        AV_PIX_FMT_YUV422P,

        AV_PIX_FMT_YUV411P,

        AV_PIX_FMT_NONE

    };

    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

    return 0;

}

#define RADIUS_MIN 0.1

#define RADIUS_MAX 4.0

#define PRE_FILTER_RADIUS_MIN 0.1

#define PRE_FILTER_RADIUS_MAX 2.0

#define STRENGTH_MIN 0.1

#define STRENGTH_MAX 100.0

#define OFFSET(x) offsetof(SabContext, x)

#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

static const AVOption sab_options[] = {

    { "luma_radius",            "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS },

    { "lr"         ,            "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS },

    { "luma_pre_filter_radius", "set luma pre-filter radius", OFFSET(luma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, PRE_FILTER_RADIUS_MIN, PRE_FILTER_RADIUS_MAX, .flags=FLAGS },

    { "lpfr",                   "set luma pre-filter radius", OFFSET(luma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, PRE_FILTER_RADIUS_MIN, PRE_FILTER_RADIUS_MAX, .flags=FLAGS },

    { "luma_strength",          "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS },

    { "ls",                     "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS },

    { "chroma_radius",            "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS },

    { "cr",                       "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS },

    { "chroma_pre_filter_radius", "set chroma pre-filter radius",  OFFSET(chroma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=PRE_FILTER_RADIUS_MIN-1},

                                  PRE_FILTER_RADIUS_MIN-1, PRE_FILTER_RADIUS_MAX, .flags=FLAGS },

    { "cpfr",                     "set chroma pre-filter radius",  OFFSET(chroma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=PRE_FILTER_RADIUS_MIN-1},

                                  PRE_FILTER_RADIUS_MIN-1, PRE_FILTER_RADIUS_MAX, .flags=FLAGS },

    { "chroma_strength",          "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS },

    { "cs",                       "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS },

    { NULL }

};

AVFILTER_DEFINE_CLASS(sab);

static av_cold int init(AVFilterContext *ctx)

{

    SabContext *sab = ctx->priv;

    /* make chroma default to luma values, if not explicitly set */

    if (sab->chroma.radius < RADIUS_MIN)

        sab->chroma.radius = sab->luma.radius;

    if (sab->chroma.pre_filter_radius < PRE_FILTER_RADIUS_MIN)

        sab->chroma.pre_filter_radius = sab->luma.pre_filter_radius;

    if (sab->chroma.strength < STRENGTH_MIN)

        sab->chroma.strength = sab->luma.strength;

    sab->luma.quality = sab->chroma.quality = 3.0;

    sab->sws_flags = SWS_POINT;

    av_log(ctx, AV_LOG_VERBOSE,

           "luma_radius:%f luma_pre_filter_radius::%f luma_strength:%f "

           "chroma_radius:%f chroma_pre_filter_radius:%f chroma_strength:%f\n",

           sab->luma  .radius, sab->luma  .pre_filter_radius, sab->luma  .strength,

           sab->chroma.radius, sab->chroma.pre_filter_radius, sab->chroma.strength);

    return 0;

}

static void close_filter_param(FilterParam *f)

{

    if (f->pre_filter_context) {

        sws_freeContext(f->pre_filter_context);

        f->pre_filter_context = NULL;

    }

    av_freep(&f->pre_filter_buf);

    av_freep(&f->dist_coeff);

}

static av_cold void uninit(AVFilterContext *ctx)

{

    SabContext *sab = ctx->priv;

    close_filter_param(&sab->luma);

    close_filter_param(&sab->chroma);

}

static int open_filter_param(FilterParam *f, int width, int height, unsigned int sws_flags)

{

    SwsVector *vec;

    SwsFilter sws_f;

    int i, x, y;

    int linesize = FFALIGN(width, 8);

    f->pre_filter_buf = av_malloc(linesize * height);

    if (!f->pre_filter_buf)

        return AVERROR(ENOMEM);

    f->pre_filter_linesize = linesize;

    vec = sws_getGaussianVec(f->pre_filter_radius, f->quality);

    sws_f.lumH = sws_f.lumV = vec;

    sws_f.chrH = sws_f.chrV = NULL;

    f->pre_filter_context = sws_getContext(width, height, AV_PIX_FMT_GRAY8,

                                           width, height, AV_PIX_FMT_GRAY8,

                                           sws_flags, &sws_f, NULL, NULL);

    sws_freeVec(vec);

    vec = sws_getGaussianVec(f->strength, 5.0);

    for (i = 0; i < COLOR_DIFF_COEFF_SIZE; i++) {

        double d;

        int index = i-COLOR_DIFF_COEFF_SIZE/2 + vec->length/2;

        if (index < 0 || index >= vec->length) d = 0.0;

        else                                   d = vec->coeff[index];

        f->color_diff_coeff[i] = (int)(d/vec->coeff[vec->length/2]*(1<<12) + 0.5);

    }

    sws_freeVec(vec);

    vec = sws_getGaussianVec(f->radius, f->quality);

    f->dist_width    = vec->length;

    f->dist_linesize = FFALIGN(vec->length, 8);

    f->dist_coeff    = av_malloc(f->dist_width * f->dist_linesize * sizeof(*f->dist_coeff));

    if (!f->dist_coeff) {

        sws_freeVec(vec);

        return AVERROR(ENOMEM);

    }

    for (y = 0; y < vec->length; y++) {

        for (x = 0; x < vec->length; x++) {

            double d = vec->coeff[x] * vec->coeff[y];

            f->dist_coeff[x + y*f->dist_linesize] = (int)(d*(1<<10) + 0.5);

        }

    }

    sws_freeVec(vec);

    return 0;

}

static int config_props(AVFilterLink *inlink)

{

    SabContext *sab = inlink->dst->priv;

    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);

    int ret;

    sab->hsub = desc->log2_chroma_w;

    sab->vsub = desc->log2_chroma_h;

    close_filter_param(&sab->luma);

    ret = open_filter_param(&sab->luma, inlink->w, inlink->h, sab->sws_flags);

    if (ret < 0)

        return ret;

    close_filter_param(&sab->chroma);

    ret = open_filter_param(&sab->chroma,

                            FF_CEIL_RSHIFT(inlink->w, sab->hsub),

                            FF_CEIL_RSHIFT(inlink->h, sab->vsub), sab->sws_flags);

    return ret;

}

#define NB_PLANES 4

static void blur(uint8_t       *dst, const int dst_linesize,

                 const uint8_t *src, const int src_linesize,

                 const int w, const int h, FilterParam *fp)

{

    int x, y;

    FilterParam f = *fp;

    const int radius = f.dist_width/2;

    const uint8_t * const src2[NB_PLANES] = { src };

    int          src2_linesize[NB_PLANES] = { src_linesize };

    uint8_t     *dst2[NB_PLANES] = { f.pre_filter_buf };

    int dst2_linesize[NB_PLANES] = { f.pre_filter_linesize };

    sws_scale(f.pre_filter_context, src2, src2_linesize, 0, h, dst2, dst2_linesize);

#define UPDATE_FACTOR do {                                              \

        int factor;                                                     \

        factor = f.color_diff_coeff[COLOR_DIFF_COEFF_SIZE/2 + pre_val - \

                 f.pre_filter_buf[ix + iy*f.pre_filter_linesize]] * f.dist_coeff[dx + dy*f.dist_linesize]; \

        sum += src[ix + iy*src_linesize] * factor;                      \

        div += factor;                                                  \

    } while (0)

    for (y = 0; y < h; y++) {

        for (x = 0; x < w; x++) {

            int sum = 0;

            int div = 0;

            int dy;

            const int pre_val = f.pre_filter_buf[x + y*f.pre_filter_linesize];

            if (x >= radius && x < w - radius) {

                for (dy = 0; dy < radius*2 + 1; dy++) {

                    int dx;

                    int iy = y+dy - radius;

                    if      (iy < 0)  iy = -iy;

                    else if (iy >= h) iy = h+h-iy-1;

                    for (dx = 0; dx < radius*2 + 1; dx++) {

                        const int ix = x+dx - radius;

                        UPDATE_FACTOR;

                    }

                }

            } else {

                for (dy = 0; dy < radius*2+1; dy++) {

                    int dx;

                    int iy = y+dy - radius;

                    if      (iy <  0) iy = -iy;

                    else if (iy >= h) iy = h+h-iy-1;

                    for (dx = 0; dx < radius*2 + 1; dx++) {

                        int ix = x+dx - radius;

                        if      (ix < 0)  ix = -ix;

                        else if (ix >= w) ix = w+w-ix-1;

                        UPDATE_FACTOR;

                    }

                }

            }

            dst[x + y*dst_linesize] = (sum + div/2) / div;

        }

    }

}

static int filter_frame(AVFilterLink *inlink, AVFrame *inpic)

{

    SabContext  *sab = inlink->dst->priv;

    AVFilterLink *outlink = inlink->dst->outputs[0];

    AVFrame *outpic;

    outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h);

    if (!outpic) {

        av_frame_free(&inpic);

        return AVERROR(ENOMEM);

    }

    av_frame_copy_props(outpic, inpic);

    blur(outpic->data[0], outpic->linesize[0], inpic->data[0],  inpic->linesize[0],

         inlink->w, inlink->h, &sab->luma);

    if (inpic->data[2]) {

        int cw = FF_CEIL_RSHIFT(inlink->w, sab->hsub);

        int ch = FF_CEIL_RSHIFT(inlink->h, sab->vsub);

        blur(outpic->data[1], outpic->linesize[1], inpic->data[1], inpic->linesize[1], cw, ch, &sab->chroma);

        blur(outpic->data[2], outpic->linesize[2], inpic->data[2], inpic->linesize[2], cw, ch, &sab->chroma);

    }

    av_frame_free(&inpic);

    return ff_filter_frame(outlink, outpic);

}

static const AVFilterPad sab_inputs[] = {

    {

        .name         = "default",

        .type         = AVMEDIA_TYPE_VIDEO,

        .filter_frame = filter_frame,

        .config_props = config_props,

    },

    { NULL }

};

static const AVFilterPad sab_outputs[] = {

    {

        .name = "default",

        .type = AVMEDIA_TYPE_VIDEO,

    },

    { NULL }

};

AVFilter avfilter_vf_sab = {

    .name          = "sab",

    .description   = NULL_IF_CONFIG_SMALL("Apply shape adaptive blur."),

    .priv_size     = sizeof(SabContext),

    .init          = init,

    .uninit        = uninit,

    .query_formats = query_formats,

    .inputs        = sab_inputs,

    .outputs       = sab_outputs,

    .priv_class    = &sab_class,

    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

};